Yea. Once I heard the difference between a $100 driver and a $10 driver, I haven't looked back.

If the 40-1043 has a Qts anywhere near 1.0, there is zero chance of making it work in a TWQT. As I remember, the 40-1254a had a Qts somewhere around 0.5, and it works much better in a MLTL. A really high Qts driver needs to be in a OB or IB.

Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.

Since no one seems to have measured the T/S parameters of your particular driver, we are all in the dark. There seems to be some anecdotal data, nothing concrete, however there is the Eight Ounce magnet motor, not particularly good for Qes. I'm assuming your really not up to purchasing a T/S parameter device.....one used to determine the specs of your driver....because it'll cost ya!
Go right ahead & build a sealed enclosure.....my "guess", anecdotal dimensions would be 13.75 " by 17.25 " by 11 " Putting the driver offset at 33/66 on the Eleven inch panel.

Yea. Once I heard the difference between a $100 driver and a $10 driver, I haven't looked back.

If the 40-1043 has a Qts anywhere near 1.0, there is zero chance of making it work in a TWQT. As I remember, the 40-1254a had a Qts somewhere around 0.5, and it works much better in a MLTL. A really high Qts driver needs to be in a OB or IB.

Bob

Well, that depends, I guess. I have drivers with approx 0.7 qts, but they are very sensitive, 96 dB. They work well in my tqwts.

I made a huge TWQT cabinet for my pair. They sounded nice, I left the whizzer in there but used about 5 grams of long fiber acoustic fluff, rolled slightly in my hands and gently pushed it behind the whizzer. That really cleaned them up especially around 1kz.
They were nice speakers, I fried the voice coils setting up a 5.1 amp.
pm me and I'll look up the dimensions.
I plan on buying a nicer pair of 8" full range for the cabs.